Cameron S. Cowan, Magdalena Renner, Martina De Gennaro, et al. Cell Types of the Human Retina and Its Organoids at Single-Cell Resolution. Cell. 2020;182(6):1623-1640.e34. doi:10.1016/j.cell.2020.08.013
Sarah E. Hadyniak, Joanna F. D. Hagen, Kiara C. Eldred, et al. Retinoic acid signaling regulates spatiotemporal specification of human green and red cones. PLOS Biology. 22(1):e3002464. doi:10.1371/journal.pbio.3002464